Struts2 <s:iterator ><s:if> <s:esle>标签使用和jstl标签循环-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_14221/article/details/82517964

本文介绍了一个使用Struts2框架实现的简单用户列表功能案例，并展示了如何通过JSTL标签库来遍历并展示从JavaBean中获取的数据。

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java代码

import java.io.Serializable;
@SuppressWarnings("all")
public class User implements Serializable{
private int id;
private String username;
private String password;
public int getId() {
  return id;
}
public void setId(int id) {
  this.id = id;
}
public String getUsername() {
  return username;
}
public void setUsername(String username) {
  this.username = username;
}
public String getPassword() {
  return password;
}
public void setPassword(String password) {
  this.password = password;
}
}

Struts2 Action

java代码

public String list() throws Exception {
   List list=new ArrayList();
   User user=new User();
   user.setPassword("admin123");
   user.setUsername("张三");
   list.add(user);
   user=new User();
   user.setPassword("admin123");
   user.setUsername("李四");
   list.add(user);
   if(list!=null){
    request.setAttribute("list", list);
    return "userinfo";
   }else{
    return "input";
   }
}

jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

 <title>用户详情</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<div align="center">
jstl标签
<c:choose>
 <c:when test="${empty list}">
 没有数据! 
 </c:when>
 <c:otherwise>
 <c:forEach items="${list}" var="ls" >
 用户名：${ls["username"] }
 </c:forEach>
 </c:otherwise>
 </c:choose>
 struts2标签
 <s:iterator value="#request.list" var="ls" >
 <s:if test="#ls.username!=''"> 
 
 用户名：<s:property value="#ls.username"/>
 </s:if>
 <s:else>
 没有数据! 
 </s:else>
 </s:iterator>

</body>
</html>